Page 65 - Hybrid PBD 2022 Tg 5 - Kimia

Kimia Tingkatan 5 Bab 4

4. Lengkapkan proses penggumpalan lateks berdasarkan rajah di bawah. SP 4.2.2 TP3 KBAT Mengaplikasi
Complete the process of coagulation of latex based on the diagram below.
A B + + C
– – +
– – + – + – + +
– – + – – – + + – – +
– – – – – – + + – –
– – – – – + – – – – – – – +
– + + + + + – – + +
– – + + + – – +
– – + +
– – + + +

Membran (a) protein bercas negatif menyebabkan zarah-zarah getah menolak antara satu
A sama lain. Lateks tidak menggumpal.
The (a) negatively charged protein membrane causes the rubber particles to repel each other. Latex does not
coagulate.

+
Ion H daripada asid (b) meneutralkan cas negatif pada membran protein.
B
+
H ions from acids (b) neutralise the negatively charges on the protein membrane.
(c) Zarah-zarah getah berlanggaran mengakibatkan (d) membran protein zarah

getah (e) pecah . (f) Molekul-molekul getah bergabung menyebabkan
lateks menggumpal.
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The (c) rubber particles colide with each other causing the (d) protein membrane of the rubber
particles to (e) break . (f) The rubber molecules combine with one another causing

latex to coagulate.

5. Terangkan bagaimana lateks menggumpal secara semula jadi. SP 4.2.2 TP3 KBAT Mengaplikasi
Explain how latex coagulate naturally.
Bakteria daripada udara memasuki lateks. Bakteria merembeskan asid laktik. Ion H meneutralkan cas negatif
+
pada membran protein menyebabkan lateks menggumpal. Akan tetapi, proses ini berlaku dengan perlahan.

+
Bacteria from the air enter latex. Bacteria secrete lactic acid. H ions neutralise the negative charges on the protein membrane causing the
coagulation of latex. However, this process occurs slowly.

6. Terangkan bagaimana penggumpalan lateks dicegah. SP 4.2.2 TP4 KBAT Menganalisis
Explain how coagulation of latex can be prevented.
Dengan menambah larutan ammonia atau larutan alkali yang lain. Larutan ammonia mengandungi ion OH
–
yang meneutralkan ion H yang dihasilkan oleh bakteria. Zarah-zarah getah kekal bercas negatif.
+
Penggumpalan lateks dicegah. / By adding ammonia solution or other alkaline solution. Ammonia solution consists of OH ions
–
that neutralise the H ions produced by the bacteria. The rubber particles remain negatively charged. Coagulation of latex is prevented.
+
Penggumpalan Lateks
Coagulation of Latex
VIDEO
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04 Hybrid Kimia Tg5.indd 136 05/11/2021 4:20 PM